Your OG could have been higher than expected if you didn't mix the top off water well enough. I also had this problem, that is getting skewed OG readings due to perhaps taking a sample off the top of the beer that might not be mixed thoroughly. Did you put the right amount of top off water in? Did you mix it and aerate the beer vigorously for a few minutes prior to pitching? I usually just use the OG that the kit suggests when calculating for FG and my beers have all been fine. The yeast mix the top off water more completely as they do their job during fermentation. No worries your beer will likely be fine, and there is nothing you can do at this time any way. Just be patient, wait two full weeks from when fermentation begins before you take your FG reading.
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